Island



FEB-56 "(anon OF TE p N ITE e STATES PATENT OFFICE.

FREDERICK EUGENE DROIVN, OF IAIUCKE'I, RHODE ISLAND.

PROCESS OF BLEACHING COTTON.

SPECIFICATION forming part of Letters Patent No. 396,551, dated January 22, 1889. Application filed May 2, 1888. Serial No. 272,596. (No specimens.)

To all whom it may concern:

Be it known that I, FREDERICK EUGENE DROWN, a citizen of the United States, residing at Pawtucket, in the county of .Proddence and State of Rhode Island, have invented a new and useful Process of Bleaching Cotton Fabrics, of which the following is a specification. I

The object of my invention is to bleach cotton fabric expeditiously without materially reducing its strength.

In my application for a patent filed March 19, 1858, Serial No. 267,707, I have described means of treating with caustic soda, soda-ash, or lime, and the washing, ohemicing, and-souring of cotton fabric in an improved keir having a centrifugal basket inclosed in a vessel which at times can be made steam-tight.

Mypresentinvention consists of the follow ing successive steps of operation I pass the cotton fabric, spread out to its full width and in a continuous manner, through a hot solution of caustic soda having a strength of from 6 to 12 Twaddle; thence through heavy squeezing-rolls, then subjecting it to the action of steam by passing it over perforated steam-pipe in an open vessel where the temperature cannot exceed 212 Fahrenheit; thence into a cold solution of caustic soda having a strength of (3 to 12 TwaddEjand a temperature of not over 110 Fahrenheit; thence through heavy squeezing-rolls. I run the cloth during this stop of the process continuously at a speed of sixty to one hundred yards per minute. I then run the cotton fabric into the bleaching-heir.- I find thellzeir as described in my application for a patient above referred to very effective, and subject it to a continuonslyeextracting circulation a boiling solution' otfioda ash and rosin in/a closed vessel, abouttiventy-five pounds of refined soda-ash and ten pounds of rosin to one ton of cotton fabric. This treatment is continued for several hours until the motes are decomposed or destroyed, when I wash the cotton fabric wit-h hot water'of not less than: 140 Fahrenheit. The cotton fabric is then treated with chlorine liquor having a strength of two-tenths of 1 Twaddle. j Then I subject it .to the action of steam in an open vessel, where the temperature cannot exceed 212 Fahrenheit. 1 The cotton fabric is'then soured, the liquor to be 100 to 110 Fahrenheit and having. a strength of two-tenths of 1 Twad dle when at a temperature of 75 Fahrenhei The fabric is now washed.

Having thus described my invention and the manner of carrying it out in practice, I

claim as my invention and desire to secure by Letters Patent 1 The improvement in the art of bleaching, consisting in passing cotton fabric spread out wide through a boiling so lu t ign of caustic soda, then subjectii igit to the action of steam bypassing it over perforated stea1n-pipe,theh cooling 'it by passing iti'nto acold of caustic soda, thenboilili V w soda aslT aiill washipgfth 1 same chug thev materralto the action chlorine liquor, then stepping, souring, and finall stantiall y as set forth.

l REDERICK EUGENE DRO WN. \Vitnesses:

SAMUEL B. Loan, CHARLES W. Loni).

12g. subt 

